How many Oz is a cereal box. A 12 ounce box holds 11 cups giving us 2772 Cheerios in the box and lots of crunchy puffiness. City Market Chex Whole Grain Breakfast Cereal 14 Oz Salty Snacks Mix Salty Snacks Snack Mix Enter Your Amount eg. . How many cups are in a box of Chex Cereal. How many cups are in a family-size box of Chex cereal. 1 cup of SNACKSGENERAL MILLSCHEX MIXTRADITIONAL FLAVOR. A 12 oz box of Rice Chex cereal contains approximately 11 cups of cereal. Amount in cups c ⅛ cup ¼ cup ⅓ cup ⅜ cup ½ cup ⅝ cup ⅔ cup ¾ cup ⅞ cup 1 cup. 15 rows Folate 20. A Chex cereal box typically contains about six cups of cereal. Percent Daily Values are based on a 2000 calorie diet. A big box holds 12-14 ounces while the mini boxes hold almost exactly 1 ounce. Snack on it or add it to your next batch of muddy buddies. There are about 16 cups of cereal in a box. Enter a New cup Value to Convert From...